I seem to remember reading that Greek made scabbards with the metal tip are marked E US within the flaming bomb. If they made them to this specification it's possible that this saw Greek service and was repaired with the tip.

As far as I know the US lend, (not sold), US M1 carbines and US Garand M1 self loading rifles to the Greek in the mid 50´s, also the appendant bayonets.
Only a few yrs. ago Greece returned the weapons to the US Gvt.